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A352182 Twice A200994. 1
0, 30, 2970, 291060, 28520940, 2794761090, 273858065910, 26835295698120, 2629585120349880, 257672506498590150, 25249276051741484850, 2474171380564166925180, 242443546019236617182820, 23756993338504624316991210, 2327942903627433946447955790, 228114647562150022127582676240 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
COMMENTS
Also 3 times A200993 and 6 times A352181.
Numbers that both doubles and triples of triangular numbers.
LINKS
Editors, L'Intermédiaire des Mathématiciens, Query 4500: The equation x(x+1)/2 = y*(y+1)/3, L'Intermédiaire des Mathématiciens, 22 (1915), 255-260 (I).
Editors, L'Intermédiaire des Mathématiciens, Query 4500: The equation x(x+1)/2 = y*(y+1)/3, L'Intermédiaire des Mathématiciens, 22 (1915), 255-260 (II).
Editors, L'Intermédiaire des Mathématiciens, Query 4500: The equation x(x+1)/2 = y*(y+1)/3, L'Intermédiaire des Mathématiciens, 22 (1915), 255-260 (III).
Editors, L'Intermédiaire des Mathématiciens, Query 4500: The equation x(x+1)/2 = y*(y+1)/3, L'Intermédiaire des Mathématiciens, 22 (1915), 255-260 (IV).
CROSSREFS
Sequence in context: A108091 A036363 A230591 * A001459 A303007 A209788
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Mar 08 2022
STATUS
approved

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Last modified February 22 18:44 EST 2024. Contains 370260 sequences. (Running on oeis4.)